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<p>
A hierarchy of classes used for storing metadata about each of your
classes.  A ProjectData object contains PackageData objects which
contain ClassData objects
which contain LineData objects.  Or, in bad ASCII art:
</p>

<p>
ProjectData <--> PackageData <--> ClassData <--> LineData
</p>

<p>
The SourceFileData class is not used during instrumention or
testing.  It is a only used when generating the reports.  Basically
it's used to lump a set of classes together when those classes come
from the same file.  This is needed because the HTML reporting
displays an entire file at a time, instead of displaying a single
class at a time.
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